The small-tooth flounder Pseudorhombus jenynsii (Paralichthyidae) is a common, yet relatively unstudied, flatfish occurring in estuaries and coastal waters around Australia. This study determined the age and growth of P. jenynsii using 1,228 specimens collected between 2004 and 2013 as bycatch by seine netting in estuaries and trawling in coastal waters in south-western Australia. Opaque zones in 1,043 sectioned otoliths were validated as forming annually by otolith edge analysis, with the first opaque zone becoming delineated after the first spring when fish are ~ 12 months old. Female P. jenynsii ranged in total length from 79 to 406 mm and males from 96 to 354 mm. The maximum observed age for females and males was 5 and 4 years, respectively. While the von Bertalanffy growth functions (VBGF) fitted to the lengths at age differed significantly between the sexes, this difference in the length at age was < 5% between the ages of 1 and 3 years (where most of the data lay). The VBGF parameters for both sexes combined are L∞: 381 mm, k: 0.53 year−1, t0: -0.15 years. The large variation in size-at-age of P. jenynsii is indicative of a presumed extended 5–6 months spring and summer spawning period. The presence of small (< 200 mm) and young (< 2 years old) P. jenynsii in estuaries and shallow coastal waters confirms the use of these environments as nursery habitats.

中文翻译：

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澳大利亚西南部河口和沿海水域小齿鲽的年龄验证和生长

小齿比目鱼 Pseudorhombus jenynsii（Paralichthyidae）是一种常见但相对未经研究的比目鱼，生活在澳大利亚周围的河口和沿海水域。本研究使用 2004 年至 2013 年间收集的 1,228 个标本，通过在澳大利亚西南部的河口围网和在沿海水域拖网捕捞的副渔获物，确定了 P. jenynsii 的年龄和生长情况。通过耳石边缘分析，1,043 个切开的耳石中的不透明区被确认为每年形成，第一个不透明区在第一个春天之后在鱼大约 12 个月大时被划定。雌性 P. jenynsii 的总长度为 79 至 406 毫米，雄性为 96 至 354 毫米。女性和男性的最大观察年龄分别为 5 岁和 4 岁。虽然拟合到年龄长度的 von Bertalanffy 生长函数 (VBGF) 在两性之间存在显着差异，但这种年龄长度差异在 1 岁和 3 岁之间（大部分数据位于该年龄）之间小于 5%。两性组合的 VBGF 参数为 L∞：381 毫米，k：0.53 年-1，t0：-0.15 年。P. jenynsii 年龄大小的巨大变化表明春季和夏季产卵期延长了 5-6 个月。河口和沿海浅水区存在小型（< 200 毫米）和年轻（< 2 岁）P. jenynsii，证实这些环境可用作苗圃栖息地。P. jenynsii 年龄大小的巨大变化表明春季和夏季产卵期延长了 5-6 个月。河口和沿海浅水区存在小型（< 200 毫米）和年轻（< 2 岁）P. jenynsii，证实这些环境可用作苗圃栖息地。P. jenynsii 年龄大小的巨大变化表明春季和夏季产卵期延长了 5-6 个月。河口和沿海浅水区存在小型（< 200 毫米）和年轻（< 2 岁）P. jenynsii，证实这些环境可用作苗圃栖息地。